Delta AS Series Programming Manual page 975

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AS Ser ies Pro gra mm in g M anu al

NOTE: Only one flag is set to ON among the three state flags, and the corresponding special flags (SM) are also set

to ON every time the communication is completed. Refer to Section 6.19.3 for the use of the special flags.

The timing for sending the instruction begins when the instruction starts. You must disable the instruction for a scan

cycle after communication is completed. The next communication instruction can be sent as soon as the instruction

is restarted.

The communication action and control sequence of the instruction are similar to MODRW instruction (API 1808). The

only difference between the two instructions is that you can send the communication command without control over

the flag for sending data.

The instruction cannot be used in the ST programming language, interrupt tasks or function block which is called

You can compare the MODRW program and MODRWE program, for example, by using the PLC COM1 and function code

03 to read eight pieces of data from D20 in the DVP-ES2. The same is true for other PLC communication ports. Refer to

the MODRW instruction (API 1808) and the following example for the use of other function codes.

The device address of D20 in the DVP-ES2 CPU (16#1020) and the content values in D20–D27 are shown in the

following table.

The AS Series PLC reads the content values from D20–D27 in the DVP-ES2 CPU through communication.

Receiving data successful.

Error occurs in receiving data.

Reception timeout flag

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